AAA86

Hi, I have a problem. I have 2 same main boards of the PLC V350-35-TA24 with same HW and SW configuration, but there is a problem. 1 of the PLC is reading the Thermocouple temperature and the other reading constantly -0.1C. I've passed the configuration a lot of times, the boards REVs and etc. it all the same.... there is probably something in the way tha confusing the Thermocouple reading in the main board but i can't find it. Is anyone can help me by providing me a solution or schematics or where the thermocouple is connected to the main board and rhough what devices it going. Thanks in advance.